a=["jack","tom","王处","lucy","lucas","Alva","张处","李楚"]
b=[22,14,2,3,5,15,21]
#b2=[i for i in b]#可行
b2=b.copy()#复制自己
#b2=b #指向同一块内存空间，无法实现sort后，对b不干扰

a.sort(reverse=True)#降序
b2.sort()

print("排序后：")
print(a)
print("b=",b)
print("b2=",b2)

b.reverse()
print("b倒转后：",b)

d=[i for i in b if i%3==0 ]
print("d==",d)